我在ubuntu 14.04中尝试修改软件和更新中的服务器我失败了，当我尝试更新时＃39; sudo apt-get update＆＃39;我收到了这个错误
W: Failed to fetch http://ppa.launchpad.net/ripps818/coreavc/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/universe/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/restricted/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/multiverse/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/universe/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/restricted/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ubuntu.mirror.tn/dists/trusty/multiverse/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
有什么帮助吗？
答案 0 :(得分：2)
尝试一下：
sudo su
cd /var/lib/apt/lists/
rm -fr *
cd /etc/apt/sources.list.d/
rm -fr *
cd /etc/apt
sudo cp sources.list sources.list.old
sudo cp sources.list sources.list.tmp
sed 's/ubuntuarchive.hnsdc.com/us.archive.ubuntu.com/' sources.list.tmp | sudo tee sources.list
sudo rm sources.list.tmp*
apt-get clean
apt-get update